Factoriser les expressions suivantes :
A= (3x+5) (x-4) - 7(3x-5)
B= (x+5)² - (x-2)²
C = (8x-3) (8-7x) + (8x-3) (-x-9)
D= (5x-9)² + (5x+10) (5x-9)
A= (3x+5) (x-4) - 7(3x-5)
B= (x+5)² - (x-2)²
C = (8x-3) (8-7x) + (8x-3) (-x-9)
D= (5x-9)² + (5x+10) (5x-9)
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B = x²+10x+25-x²+4x-4=14x+21
c=64x-56x²-24+21x-8x²-72x-3x+27=-64x²+10x+3
D=25x²-90x+81+25x²-45x+50x-90=50x2-85x-9
B = (x + 5 + x - 2) (x + 5 - x - 2)
C =(8x - 3) ((8 - 7x) + (-x - 9))
D = (5x - 9) (((5x - 9) + (5x + 10))